Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by function]
6. colorant (material)
7. dye
8. [dye by composition or origin]
9. natural dye
10. vegetable dye

Anotations

Scope note:

A yellow natural organic dye believed to originate from the Amur cork tree, Phellodendron amurense, of which berberine is the principal colorant. The paper of roughly 40,000 early printed Chinese documents was dyed yellow by this extract.